Results 101 to 110 of about 27,938 (255)
Transactions of the Institute of British Geographers, EarlyView.Abstract Based on recently opened multilingual archives, this paper addresses relationally three transnational cases of early networking for critical and radical geography that took place in different countries and languages between the 1970s and the 1980s.
Federico Ferretti
wiley +1 more source
The Planetary Nebula Luminosity Function [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractAlthough the method has no theoretical explanation, the [Oiii]λ5007Å planetary nebula luminosity function (PNLF) is an extremely valuable tool for obtaining accurate (< 10%) extragalactic distances out to ~ 18 Mpc. Because the PNLF works in large galaxies of all Hubble types, it is one of the best tools we have for cross-checking the results
openaire +5 more sources
JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star
The Astrophysical JournalThe planetary nebula NGC 6720, also known as the “Ring Nebula,” is one of the most iconic examples of nearby planetary nebulae whose morphologies present a challenge to our theoretical understanding of the processes that govern the deaths of most stars ...
Raghvendra Sahai +18 more
doaj +1 more source
, 1994 The published properties of M1-78 are discussed with the purpose to resolve the object's classification as either a planetary nebula or an ultracompact HII region.
Acker +22 more
core +1 more source
(Re)wilding London: Fabric, politics, and aesthetics
Transactions of the Institute of British Geographers, EarlyView.Short Abstract Rewilding has become established as a new mode of nature conservation. Until recently, cities and the urban were neglected by rewilding discourse; the idea of urban rewilding seen as oxymoronic. Of late, however, there has been a shift, with growing enthusiasm amongst metropolitan authorities, civil society, and citizens in major cities.
Jonathon Turnbull +2 more
wiley +1 more source
JWST/MIRI Study of the Enigmatic Mid-infrared Rings in the Planetary Nebula NGC 1514
The Astronomical JournalWhile NGC 1514 is an elliptical, but complex, planetary nebula at optical wavelengths, it was discovered to have a pair of infrared-bright, axisymmetric rings contained within its faint outer shell during the course of the Wide-field Infrared Survey ...
Michael E. Ressler +5 more
doaj +1 more source
MULTI-STAGES OPTIMIZED PHOTOIONIZATION MODELLING OF PLANETARY NEBULA LMC SMP-21
Odessa Astronomical Publications, 2012 The new approximation expression for the representation of gas density distribution in planetary nebulae envelopes was proposed. The new multi-stages method for the caclulation of the chemical composition and physical parameters of planetary nebulae ...
B. Ya. Melekh +5 more
doaj +1 more source
The Planetary Nebula Luminosity Function: Pieces of the Puzzle
, 2009 Extragalactic surveys in the emission line of [O III] 5007 have provided us with the absolute line strengths of large, homogeneous sets of planetary nebulae.
Balick +7 more
core +1 more source
Physiology of nitrogen: A life or death matter
Experimental Physiology, EarlyView.Abstract With each breath, four out of every five molecules we inspire are nitrogen (N2), since this gas constitutes ∼80% of the atmospheric air that surrounds us. Despite its abundance and unlike molecular oxygen, N2 has traditionally held less appeal among physiologists given its lack of reactivity and corresponding inability to support combustion or
Damian M. Bailey +2 more
wiley +1 more source
Testing the binary hypothesis for the formation and shaping of planetary nebulae
, 2012 There is no quantitative theory to explain why a high 80% of all planetary nebulae are non-spherical. The Binary Hypothesis states that a companion to the progenitor of a central star of planetary nebula is required to shape the nebula and even for a ...
Bojicic, I. +7 more
core